CSLB C-16 Fire Protection (Trade Exam) — All Questions
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96 questions
A sprinkler's glass bulb has lost its liquid but is not visibly cracked. What does the manufacturer say?
- a.Do not install it, since liquid loss is a defect✓
- b.Install it, but in light hazard areas
- c.Install it, since an intact-looking bulb is acceptable
- d.Install it once the bulb has been dried off
The manufacturer says not to install a bulb-type sprinkler if the bulb is cracked or has lost liquid, and a small air bubble should be present when it is held horizontally. Installing it in light hazard areas only does not change that, because hazard class has no bearing on the defect. An intact-looking bulb is not enough when liquid is gone. Drying the bulb does not restore lost liquid.Manufacturer data sheet (Tyco TFP690)
What size air bubble should a good glass-bulb sprinkler show when held horizontally?
- a.Half the length of the bulb
- b.No bubble is present
- c.About 1/4 inch across✓
- d.About 1 inch across
A good bulb shows a small air bubble of approximately 1/4 inch when held horizontally. Half the length of the bulb is far larger than a normal bubble. No bubble means liquid has been lost, so it indicates a defect. One inch across is larger than the bulb's normal bubble.Manufacturer data sheet (Tyco TFP690)
A painted sprinkler is found at final inspection. What is the correct action?
- a.Scrape the paint off and keep it in service
- b.Replace it; sprinklers must not be painted✓
- c.Leave it; the bulb still works through paint
- d.Cover it with an escutcheon to hide the paint
Sprinklers must never be painted, plated, coated or otherwise altered after leaving the factory, and the checklist says heads are not painted or covered, so a painted one is replaced. Scraping the paint off risks damaging the bulb or frame and leaves a sprinkler no longer factory-original. Leaving it because the bulb still works ignores that paint can delay or prevent operation. Covering it with an escutcheon hides the paint without fixing it.Manufacturer data sheet and Idaho acceptance checklist
What is the correct sequence for threading a sprinkler into its fitting?
- a.Thread sealant, hand-tighten, then wrench on the wrenching area✓
- b.Thread sealant, then tighten with a pipe wrench
- c.Wrench first, then thread sealant on the sprinkler body
- d.Hand-tighten without sealant, then wrench on the deflector
The steps are to apply sealant to the pipe threads, hand-tighten, then finish with the correct sprinkler wrench on the wrenching area. A pipe wrench can crush the frame and distort the body. Wrenching first puts the sealant on after the joint is already tight, so it cannot seal. Tightening on the deflector bends it and works against the no-sealant error of leaving the threads unsealed.Manufacturer data sheet (Tyco TFP690)
What torque range does a manufacturer give for a leak-tight 3/4 inch NPT sprinkler joint?
- a.25 to 35 lb-ft
- b.10 to 20 lb-ft✓
- c.7 to 14 lb-ft
- d.2 to 8 lb-ft
The data sheet gives 10 to 20 lb-ft for a 3/4 inch NPT joint and 7 to 14 lb-ft for a 1/2 inch NPT joint. The other ranges are not given.Manufacturer data sheet (Tyco TFP690)
What does a sprinkler wrench slip that damages a sprinkler require?
- a.Replacing the sprinkler✓
- b.Painting the frame
- c.Reinstalling it upside down
- d.Re-tightening it by hand
Sprinklers damaged by dropping, striking or wrench twist or slippage must be replaced. Painting the frame is itself prohibited and hides damage. Reinstalling it upside down changes the discharge pattern and does not repair the damage. Re-tightening by hand does not undo damage already done to the frame or bulb.Manufacturer data sheet (Tyco TFP690)
How far from a wall must sprinklers be, at minimum, under the acceptance checklists?
- a.4 inches✓
- b.24 inches
- c.12 inches
- d.1 inch
The checklists require sprinklers at least 4 inches from the wall and properly spaced. One inch is too close and 12 and 24 inches are not the minimum.Idaho and Mercer Island acceptance checklists
What does the checklist say about hangers near upright sprinklers?
- a.Hangers are not used on branch line pipe
- b.Hangers must be within 12 inches of each head
- c.Hangers stay at least 3 inches from uprights✓
- d.Hangers must touch the frame of each sprinkler
Hangers are not within 3 inches of upright sprinklers, so the hanger does not obstruct the spray. A rule that hangers must touch the frame has it backward. A requirement to be within 12 inches of each head is not stated, because spacing is set by pipe size and distance from the end sprinkler. Banning hangers on branch lines contradicts the one-hanger-per-section rule.Idaho State Fire Marshal acceptance checklist
Where may sprinklers that are subject to damage need a guard?
- a.Where they could be struck or grabbed✓
- b.Inside stairwells and exit passages
- c.In areas above 20 feet in height
- d.In dry pipe systems
The checklist says sprinkler heads have a guard if subject to damage, and the federal criteria apply guards to sprinklers low in unfinished areas or that can be grabbed. Stairwells and exit passages have no guard rule of their own, since a guard depends on exposure to damage. Height above 20 feet does not matter, because a high sprinkler is harder to strike. Dry pipe systems have no guard rule, because system type does not create the exposure.Idaho acceptance checklist and UFC 3-600-01
What does the federal criteria document say about changes of pipe size?
- a.Through tapered reducing pipe fittings✓
- b.Through plain couplings of the same size
- c.Through nipples cut to length in the field
- d.Through bushings instead of reducers
Changes in pipe sizes must be made through tapered reducing pipe fittings. Bushings, plain couplings and field-cut nipples are not the stated method.UFC 3-600-01 section 9-7
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What does the federal criteria document require of fittings, mechanical couplings and gaskets?
- a.That couplings be reused from old systems
- b.That they come from the same manufacturer✓
- c.That the gaskets be field cut
- d.That they be from different manufacturers
Fittings, mechanical couplings and rubber gaskets must be from the same manufacturer so the parts are matched. Different manufacturers is the opposite of that rule. Reusing couplings from old systems is not allowed, since their gaskets and condition are unknown. Field-cut gaskets do not give the sealing the listed gasket gives.UFC 3-600-01 section 9-7
What hole clearance does the checklist call for around 4-inch pipe passing through a wall that is required to be fire rated?
- a.Cut to the pipe size, with grout packed in
- b.8 inches larger, with expanding foam
- c.4 inches larger, with a listed firestop✓
- d.2 inches larger, with no firestop
Holes are 4 inches larger for pipe 4 inches and larger and 2 inches larger for pipe 1 to 3-1/2 inches, and a listed fire stop system is used for penetration holes. Grout, foam and no firestop do not meet that.Idaho State Fire Marshal acceptance checklist
Where are flexible couplings used at a floor penetration in a multistory building, for pipe 2-1/2 inch and larger?
- a.Where the pipe reaches the roof
- b.Within 6 inches of each sprinkler head
- c.Within 12 inches above and below the floor✓
- d.Within 48 inches above the floor
The checklist places flexible couplings within 12 inches above and below a floor penetration in multistory buildings, along with other locations such as structural separations and riser tops and bottoms. The roof is not a floor penetration. Six inches from each sprinkler head is not a coupling location. Forty-eight inches above the floor is farther than the 12-inch limit.Idaho State Fire Marshal acceptance checklist
What is provided at a building seismic joint, according to the checklist?
- a.A rigid welded pipe loop without joints
- b.A single flexible coupling at the main
- c.A solid steel sleeve cast into the wall
- d.A 6-ell seismic separation assembly✓
A 6 ell seismic separation assembly or a listed flexible pipe assembly is provided at building seismic joints. Rigid loops and solid sleeves would not allow movement, and a single coupling is not the stated assembly.Idaho State Fire Marshal acceptance checklist
How are risers in multistory buildings supported, per the checklist?
- a.At each floor and each ceiling hanger
- b.At the base of the riser and at the offsets
- c.At the top of the riser and at the base
- d.Lowest level, alternate levels, offsets and top✓
Risers are supported at the lowest level, at each alternate level, above and below offsets and at the top. Supporting at every floor and ceiling hanger is more than the pattern calls for. Supporting only at the base and offsets omits the top and the alternate levels. Supporting only at the top and base leaves the middle floors unsupported.Idaho State Fire Marshal acceptance checklist
How are C-clamps restrained, according to the checklist?
- a.A second C-clamp set on the same flange
- b.No restraint is needed on C-clamps
- c.A strap bolted through if the beam has no lip✓
- d.Tape wrapped several times around the rod
Restraining straps are on all C-clamps, and the strap is bolted through if there is not a lip on the beam. A second C-clamp on the same flange adds nothing to resist the clamp slipping off. No restraint is wrong, because the rule asks for a strap on every C-clamp. Tape on the rod does not hold the clamp to the flange.Idaho State Fire Marshal acceptance checklist
How long may a sprig be before it must be restrained against lateral movement?
- a.Longer than 1 foot
- b.Longer than 10 feet
- c.Longer than 4 feet✓
- d.Longer than 20 feet
Sprigs greater than 4 feet are restrained from lateral movement under the checklist. One foot is too short a threshold, and 10 and 20 feet are too long.Idaho State Fire Marshal acceptance checklist
How must a wet system's main drain be routed, according to the checklist?
- a.To the exterior through a turned-down elbow✓
- b.Into the ceiling space above the riser
- c.Into the nearest sink in the riser room
- d.Capped, with a test port on the cap
The main drain is routed to the exterior with a turned-down elbow or to an inside drain capable of handling the water flow, and a flow test is performed. A sink, the ceiling space and a capped port cannot take the full flow.Idaho State Fire Marshal acceptance checklist
What size main drain does the checklist give for a 6-inch riser?
- a.4 inch
- b.1-1/4 inch
- c.2 inch✓
- d.3/4 inch
The drain is 2 inch for a riser of 4 inches or greater, 1-1/4 inch for a riser from 2-1/2 to 3-1/2 inches and 3/4 inch for a riser up to 2 inches. Four inches is not a stated drain size.Idaho State Fire Marshal acceptance checklist
Where are gauges located on a wet system riser, per the checklist?
- a.At the fire department connection
- b.At the top of the riser
- c.At the last sprinkler on the longest line
- d.Above and below the riser check valve✓
Gauges are provided above and below the riser check valve so supply pressure and system pressure can be read. The fire department connection is not where those two pressures are read. The top of the riser would give only one reading, not both sides of the check valve. The last sprinkler on the longest line is the hydraulically remote head, not a gauge location.Idaho State Fire Marshal acceptance checklist
What must be attached permanently to the riser according to the checklist?
- a.A label with the hydraulic calculations✓
- b.A photograph of the installers
- c.The sprinkler manufacturer's catalog
- d.A copy of the building permit receipt
A permanent label with the hydraulic calculations is attached to the riser so anyone who changes the system can see its design basis. A photograph of the installers is not a required item. The manufacturer's catalog is not something the checklist asks to be attached. A building permit receipt is paperwork for the file, not a riser label.Idaho State Fire Marshal acceptance checklist
Which means of supervising water supply valves does the fire code allow for fire pump valves?
- a.Leaving the valves unsupervised
- b.Painting the handwheels red
- c.Locking the valves open✓
- d.Posting a notice on the door
The fire code lists central-station, proprietary or remote-station signaling, local signaling to an attended location, locking valves open, and sealing with a weekly recorded inspection in fenced enclosures. Leaving valves unsupervised is exactly what the rule prevents. Painting handwheels red marks them but does not supervise them. A notice on the door does not detect or prevent closing a valve.2025 CFC 913.4
Which pressures does the checklist test pressure-reducing valves at?
- a.The static outlet pressure
- b.The minimum inlet pressure
- c.Zero flow and half of normal pressure
- d.Maximum and normal inlet pressures✓
PRVs are tested at maximum and normal inlet pressures, with the supply pressure recorded on the certificate, a relief valve on the discharge side and gauges on each side. The other conditions are not the stated test.Idaho State Fire Marshal acceptance checklist
What does the university guide say about backflow preventer testing?
- a.A shut-in pressure test held at 400 psi
- b.A visual check made without flow
- c.A test run at half the calculated flow
- d.A forward-flow test at the calculated flow rate✓
The guide calls for forward-flow testing of the backflow preventer at the calculated flow rate. A shut-in pressure test, a visual check and half flow do not verify the design flow.George Mason University inspection guide
How long after tripping must a dry system deliver water to the inspector's test connection, unless exceptions apply?
- a.10 seconds
- b.60 seconds✓
- c.5 minutes
- d.30 minutes
The guide says water must be delivered within 60 seconds unless the system has a quick-operating device or another exception. Ten seconds is too short, and 5 and 30 minutes are not the dry-pipe limits.George Mason University inspection guide
What is the checklist's acceptable air loss for a dry system's 24-hour test at 40 psi?
- a.Less than 1.5 psi✓
- b.Less than 5.0 psi
- c.Zero loss is required
- d.Less than 10 psi
The 24-hour test at 40 psi allows less than 1.5 psi of loss. Five psi and 10 psi are too much loss for the test to be passed. Demanding zero loss is not the standard, because some very small loss is accepted within the limit.Idaho State Fire Marshal acceptance checklist
A dry system trips at 22 psi. At least what air pressure is it set to under the checklist?
- a.42 psi✓
- b.62 psi
- c.32 psi
- d.22 psi
Air pressure is set at least 20 psi above the trip pressure, so 22 + 20 = 42 psi. Setting at the trip pressure or 10 psi over, or adding 40, does not follow the rule.Idaho State Fire Marshal acceptance checklist
When is the weld inspection required for sprinkler piping with welded outlets, in the Sacramento standard?
- a.Before the piping is installed✓
- b.At the final inspection
- c.After the ceiling is closed
- d.After the hydrostatic test
The standard requires a weld inspection for all piping with welded outlets prior to the piping being installed. Inspecting after testing, after closing the ceiling or only at final comes too late to see the welds.Sacramento Metropolitan Fire District FPS 1
A wet system has a working pressure of 160 psi at its low point. What hydrostatic test pressure applies under the checklist?
- a.210 psi for 2 hours✓
- b.200 psi for 2 hours
- c.160 psi for 2 hours
- d.260 psi for 2 hours
Above 150 psi working pressure the test is 50 psi above working pressure, so 160 + 50 = 210 psi for 2 hours. Two hundred psi ignores the higher requirement that applies once working pressure exceeds 150 psi. One hundred sixty psi is only the working pressure, with no margin. Two hundred sixty psi adds 100 psi, not 50 psi.Idaho State Fire Marshal acceptance checklist
What triggers a non-interlock preaction system to admit water to the piping?
- a.A loss of building electrical power
- b.Either a detector or an automatic sprinkler operating✓
- c.A detector and an automatic sprinkler operating together
- d.Manual operation at the control panel
A non-interlock system admits water on either trigger, detection or an automatic sprinkler operating. Requiring a detector and a sprinkler together describes double interlock. Loss of building power is not a trigger and does not release water. Manual operation at the control panel is a separate means of operation, not what triggers the system.Contractor and manufacturer descriptions of NFPA 13 preaction types
What does a single-interlock preaction system require before water enters the piping?
- a.Operation of a sprinkler head
- b.A manual pull station and a sprinkler
- c.Operation of the detection system✓
- d.Detection and a sprinkler operating together
A single-interlock system admits water when the detection system activates, but discharge still needs a sprinkler to reach its thermal rating. Sprinkler-only and both-events triggers describe other types.Contractor description of NFPA 13 preaction types
What is the difference between a double-interlock preaction system and a deluge system?
- a.Double interlock is wet; deluge is dry
- b.Double interlock uses automatic sprinklers; deluge uses open ones✓
- c.Double interlock needs no detection; deluge needs it
- d.Double interlock uses open sprinklers; deluge uses automatic ones
A double-interlock system is similar to a deluge system except that automatic sprinklers are used, and it requires both a detection event and sprinkler operation. Calling double interlock wet and deluge dry is wrong, because both keep the piping dry. Saying double interlock needs no detection reverses the facts, because it needs detection and deluge needs it too. The option that gives double interlock open sprinklers and deluge automatic ones swaps the two.NAFFCO double interlock preaction description
When a deluge valve opens, where does water discharge?
- a.From the main drain
- b.From every open sprinkler on the system✓
- c.From sprinklers above the detector that alarmed
- d.From the sprinkler nearest the fire
In a deluge system the sprinklers are open, so water discharges from all of them once the valve opens. The main drain is a test and drain outlet, not a discharge point for the system. Sprinklers above the detector only would be a zoned arrangement, which is not how a deluge valve behaves. The sprinkler nearest the fire alone would be the behavior of an automatic sprinkler system.NAFFCO double interlock preaction description
Under San Francisco's rule, which preaction type is acceptable for deep-freeze facilities?
- a.Double interlock✓
- b.Wet pipe, which stays filled with water
- c.None of the preaction types is acceptable
- d.Deluge, with open sprinklers
San Francisco accepts double-interlock systems for deep-freeze facilities, where accidental valve operation may freeze the pipe in minutes. Wet pipe would freeze in that space. Deluge would flood every sprinkler on one trigger. Refusing every preaction type ignores the rule.San Francisco Fire Department 4.21
Why does San Francisco restrict double interlock in computer rooms of wet-pipe buildings?
- a.Because detectors do not work indoors
- b.Because the pipes corrode inside the walls
- c.Because water release may be delayed too long✓
- d.Because the system floods the room too fast
The department considers double interlock inappropriate in those rooms because an unacceptable delay may occur in the release of water, and approves only single interlock for them. Detectors do work indoors, so that is not the reason. Corrosion inside walls is not what the rule says. The concern is the opposite of flooding too fast, which is the delay.San Francisco Fire Department 4.21
In a cross-zoned preaction system, what opens the valve?
- a.A drop in air pressure alone
- b.Operation of the first detector
- c.A broken sprinkler head
- d.Operation of a second detector✓
The valve opens when a second detector in the protected space operates; the first only operates local alarms and signals the fire alarm system. A broken sprinkler or air loss produces a trouble signal without opening the valve.Harvard Medical School Facilities Design Standard, Division 21
In a cross-zoned preaction system, what does low air supervisory pressure indicate?
- a.That water has reached the open sprinklers
- b.That the valve has opened and water has flowed
- c.That the second detector has operated
- d.Piping damage or an opened sprinkler✓
The piping is supervised with low air pressure to detect damage or opened or damaged sprinklers, and a leak gives a trouble alarm without discharge. It does not mean the valve has opened or a detector has operated.Harvard Medical School Facilities Design Standard, Division 21
What kind of valve does the university standard describe for its preaction system?
- a.A hydraulically operated diaphragm valve with trim✓
- b.A swing check valve without release trim
- c.A manual gate valve with a chain and wheel
- d.A spring-loaded pressure relief valve
The standard describes a hydraulically operated differential diaphragm valve fully trimmed with electric actuator, gauges, low pressure warning switch, drain, switches and external reset. A swing check valve without release trim cannot hold water back or release it on a signal. A manual gate valve has no automatic release. A spring-loaded pressure relief valve is a pressure-control device, not a preaction release valve.Harvard Medical School Facilities Design Standard, Division 21
What does the acceptance checklist say trips a preaction or deluge system?
- a.Activation of the detection system✓
- b.Operation of the fire pump
- c.Opening of the inspector's test valve
- d.Loss of pressure in the city main
Preaction and deluge systems are tripped by activation of the detection system. City main pressure, the test valve and pump operation are not the trip mechanism.Idaho State Fire Marshal acceptance checklist
What water-delivery condition applies to preaction systems under the checklist?
- a.Water reaches the nearest sprinkler, then stops
- b.Water arrives at the furthest point in 1 second
- c.Water is not required to reach the furthest point
- d.Water arrives within the time shown on the plans✓
Dry and preaction systems are tested so water reaches the furthest point within the time period provided on the plans or water delivery calculations. The other statements do not describe the requirement.Idaho State Fire Marshal acceptance checklist
What minimum air pressure is maintained on a supervised preaction system with more than 20 sprinklers?
- a.At least 7 psi✓
- b.At least 40 psi
- c.At least 1 psi
- d.At least 20 psi
Preaction systems exceeding 20 sprinklers automatically supervise pipe pressure, maintaining at least 7 psi, and the detection devices. The other pressures are not that supervisory level.Idaho State Fire Marshal acceptance checklist
Which flow device is not allowed on a preaction system?
- a.A tamper switch on a control valve
- b.A pressure switch waterflow device
- c.A mechanical waterflow alarm gong device
- d.A paddle-type waterflow device✓
The checklist says paddle-type water flow is not allowed for dry, preaction or deluge systems. A pressure switch waterflow device senses a pressure change and is not a paddle in the pipe, so it is not ruled out by that statement. A mechanical waterflow alarm gong is a water-motor device that does not use a paddle in the pipe, so it is not ruled out either. A tamper switch on a control valve monitors valve position, not flow, so the statement does not apply to it.Idaho State Fire Marshal acceptance checklist
What must be true of a preaction system's riser room in winter?
- a.It is left open to outside air
- b.It is kept below freezing to dry the pipe
- c.It is unheated if the piping is galvanized
- d.It is heated✓
The checklist says the riser room is heated for dry and preaction systems, because the valve, trim and any water-filled parts can freeze. Leaving it open to outside air invites freezing. Keeping it below freezing to dry the pipe has no basis, because the pipe is dry already and the trim is not. Galvanized piping does not remove the need for heat, because the trim and valve are not galvanized pipe.Idaho State Fire Marshal acceptance checklist
Which test applies to a double-interlock system in addition to the hydrostatic test?
- a.A dry-pipe tank pressure test
- b.A forward flow test of the detectors
- c.A 100 psi water test for 1 hour
- d.A 40 psi air leak test for 24 hours✓
Dry and double-interlock systems are tested at 200 psi for 2 hours and also hold a 40 psi air leak test for 24 hours with less than 1.5 psi loss. A dry-pipe tank pressure test is not a test the checklist calls for. A forward flow test of the detectors tests backflow devices, not detection. A 100 psi water test for 1 hour is below the 200 psi for 2 hours requirement.Idaho State Fire Marshal acceptance checklist
How fast must a double-interlock system deliver water to the test connection, according to a contractor's guide citing NFPA 13?
- a.No time limit is stated
- b.Within 5 seconds
- c.Within 60 seconds✓
- d.Within 10 minutes
The guide says NFPA 13 requires double-interlock systems to deliver water to the test connection within 60 seconds, which is why they need larger design areas. Saying no limit is stated contradicts the guide. Five seconds is far faster than a dry piping system can deliver. Ten minutes is far too slow for the limit.Contractor guide to preaction systems
Who normally installs and spaces the smoke detectors for a preaction release, per the university standard?
- a.The sprinkler fitter, to NFPA 13
- b.The detection contractor, to NFPA 72✓
- c.The owner, without a standard
- d.The plumber, to the plumbing code
Detectors are installed and spaced in compliance with the manufacturer's specifications and NFPA 72, as part of the detection system, so the detection contractor does that work. The sprinkler fitter works to NFPA 13, which governs the piping, not detector spacing. The owner without a standard leaves the spacing unregulated. The plumber works to the plumbing code, which has no rule for detectors. The C-16 job at that interface is the valve, trim, piping and sequence coordination.Harvard Medical School Facilities Design Standard, Division 21
Why does the university standard fit heat detectors rather than smoke detectors in some rooms?
- a.Where the room has no electrical supply
- b.Where the room is used for dry storage
- c.Where smoke detectors would be unfeasible✓
- d.Where the ceiling height is below 8 feet
Heat detectors are used only if ambient conditions cause smoke detectors to be unfeasible, such as generator rooms. A room with no electrical supply could not run either detector type, so it does not choose one over the other. Dry storage is not a condition that defeats smoke detection. A low ceiling height does not by itself make smoke detectors unfeasible.Harvard Medical School Facilities Design Standard, Division 21
What response time does the federal criteria document require for high-speed deluge systems?
- a.500 milliseconds or less✓
- b.5 minutes or less
- c.60 seconds or less
- d.5 seconds or less
High-speed deluge systems are required to have a response time of 500 ms or less, which is half a second. Five minutes, 60 seconds and 5 seconds are all far slower than that. Ultra-high-speed systems are held to a faster 100 ms, but that is a separate category.UFC 3-600-01 section 9-6
Where does the federal criteria document allow galvanized piping?
- a.A dry pipe system inside a building
- b.A wet pipe system inside a building
- c.Deluge systems, valve trim and exterior drains✓
- d.Underground fire mains and hydrant laterals
Galvanized piping is permitted only for deluge sprinkler systems, valve trim piping and drain piping exposed to the facility exterior in that document. Wet, dry and underground uses are not allowed by it.UFC 3-600-01 section 9-7
What does a dedicated control valve for a shunt-trip room do, in the federal criteria document?
- a.Drains the riser after each acceptance test
- b.Isolates the fire pump from the water supply
- c.Replaces the main control valve at the riser
- d.Serves rooms where power is shunt-tripped first✓
The dedicated assembly serves rooms that require shunt-tripping of equipment power before or with the application of water, and sits outside the area it serves. It does not isolate the pump, drain the riser or replace the main valve.UFC 3-600-01 section 9-7